Machine fob photogbaphic lighting



J. M. GREEN. MACHINE FOR PHOIOGRAPHIC LIGHTING.

APPLICATION FILED NOV- 30-1918.

Patented Nov. 11, 1919.

I vwewlioz 5 7163M Green,

76 t ai JAIMES M. GREEN, OF GHICAGOQILLINOIS.

' MACHINE FOR PHOTOGRAPHIC LIGHTING.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Application filed November 30, 1918. Serial No. 264,835.

Lighting, of which the following is a specification.

My invention relates tomachines for lighting photographic studios, andother similar work where photographic lates or films are used, and oneof the 0 jects of my invention, is'to secure a maximum of results uponthe plate or film, from a minimum of illumination. As is well known, theemulsion employed on the ordinary .photographic plate or film. is highlysensitive to the light from the violet end of the spectrum, but onlyvery slightly afl'ected bythe light from the remainder of the spectrum.As a result, only a very small portion of the light usually employedknown as white light is of any effect, as only a small portion of itconsists of the violet rays.

To accom lish my said object I employ a machine fgr lighting in which Iarrange a special combination of adjustable clear and colored lights andcolored reflectors, so arranged that all of the colors are blended toproduce a violet ray, and adjustable so that the entire illumination maybe directed upon the objects to be photographed,

a design arranged for seven incandescent thereby securing a maximum ofresults from the illumination.

The above, and other ob ects are secured by the special meansillustrated in the accompanylng drawings and described in the following.specification and therein more particularly pointed out and. claimed.

In the drawings forming part of this specification, in which likenumerals of reference refer to similar parts throughout the variousviews,

Figural is a front elevation of one style I of my machine as designedfor lighting photographic studios.

Fig. 2 1s a side elevation of the same. Fig. 3 is a sectional view ofthe lighting head, along the line 3-3 of Fig. 1, showing the arrangementand relative location of the various parts emplo ed.

Fi 4 is a detail view 0 one of the ad justa le lighting units, withreflector.

Referring to the accompanying drawings,

I have shown my machine as supported upon a standard 1, which may be ofany usual design, but I have referably shown it as supported upon apedestal having feet at 2. I have also preferably shown a'standard inwhich the parts are made to telescope as shown at 3, to permit theraising and lowering of the lighting head, as may be required inoperation. At 4 in the standard I have provided an adjustable joint forthe purpose of adjusting the lighting head forward or backward, as maybe required for the special service for which it is used. Thisadjustable joint is especially shown in the detail drawing at Figs. 1and 2. j

The lighting head consists of the outer casing, or body part 5,containingand supporting thev other parts hereinafter 'described, whichsaid casing is of substantially the form shown. It is suitably wired forelectric light service which is not shown, one wire being-carried toeach of the light units hereinafter described. At the front of saidcasing, I have provided J an open case 13 for holding the screen 10 andthe lens 11. Said case is hinged to the easing at 14 and has a suitablecatchfor holding it in position at 15, thus permitting the free openinand closing of said case for convenience 1n adjusting the lightingunits, and the reflectors, as hereinafter more par.- ticularlydescribed.

In my illustrationFig. 1, I have shown 1i hts, one in the center, andone at each point of a hexagon surrounding said center, and haveindicated them by the numeral 7. Arranged in the rear of each light, Ihave provided a small reflector 8, arranged to throw the li ht from thelight in front of it, directly orward. In the rear of these reflectors,and forming a lar e reflector to reflect forward any rays w 1ch may notbe reflected forward by the individual reflectors 8, I have provided thelarge refleeting surface 9, which is concave in its to permit eachlighting unitto be adjusted 1 toward the center, or away from the centerthus aflording a ready facility for adjusting the lights to throw thefull lighting upon the particular objects desired to be illuminated.

In front of said"lights, I have provided the lens 11, for the purpose ofcondensing the rays of light upon any particular-object, and also forthe purpose of blending the rays' from the various light units as"arranged as shown in Fig. 1, with'a." large.

clear'electricv lamp at the center, having a clear or polished reflectorin its'rear, while arranged about it in. their order, I employ smallerelectric lamps, (the shade of each lamp and its individual reflectorbeing the -same,) colored rose madder, cobalt blue,

. crimson lake, pink madder, carmine and Prussian blue. The reflector 9I p e ferably tint blue, thereby providing a reflection for any raysescaping from the individual reflectors 8 which-will blend them into theone common tint desired to be attained.

By this construction and arrangement, I secure a combination of colorswhich forms the nearest approximation to violet rayjwhic h has"heretofore been produced, and a color which can be. directed directlyupon the objects to be illuminated, and which will as produce themaximum of eflectupon the photographic plate or: film employed .withoutothercolor screen, orotherdevice employedheretofore-to harmonize thecolors, and each" of which greatly retards the time of exposure. I I

While I have illustratedand described my invention as employed forphotographic purposes inphotograph studios, and the like, I do "notwi'shto be confine d exclusively to that class of work, as the samearrangement may be equally well employed in making negatives 1 formoving picture films, for printing moving picture films from suchnegatives, for making lantern slides and transparencies, and for use inthe usual work of printing on photographic papers.

Having thus described my invention, what Icl'aim and desire to secure byLetters Patj ent,"is the following:

' -'lighting,' the'combination of a large refiec tor; several lightingunits adjustably mounte'd in"ff'o'nt of said reflector; an adjustable 1.In a lighting system for photographic reflector mounted in rear of eachof said light units; a screen supported in front of said light units,and a lens supported in front of said light units, substantially asshown and described.

2. In a lighting system for photographic studies and the like, thecombination of a reflector adjustably mounted upon a support apluralityof light units mounted in front of said reflector; individual reflectorsmounted in rear of each of said light units; a screen mounted vinifrontofsaid light units, and a lens also mounted in front of said lightunits, substantially as shown, and for the purposes'set forth.

3. In asystem for photographic. studio lighting and the like, thecombination'of a reflector tinted blue, having one central clear lightmounted in front of it,"and a plurality of colored lights mounted infront of said reflector; each of said colored lights being adjustablymounted, and each of saidcolored lights having an individual reflectorofthe same tint as itself; a screen mounted in front of said lights, anda lens also mounted in front of said lights, substantially as shown, andfor the purposes set forth.

I. In a lighting system for photographic studios and the like, thecombination of a large reflector; seven light units and seven:

individual reflectors, one in the rear of each light unit; said lightunits havingthe colors clear, rose madder, cobalt blue, crimson lake,pink madder, carmine and Prussian blue; each individual reflector havingthe same color as its respective lightv unit; a screen for. blendingsaid colors; a lens also for blending'said colors to produce anapproximation of the violet ray, substantially as shown, and for thepurposes set forth.

5. In a'device for lighting photographic studios, and the like thecombination of a lighting head adjustably mounted upon an adjustablestandard; lighting units within the lighting head ad ustably mounted; areflector in the rear of each lighting unit, a larger reflector in therear'ofall the lighting units and reflectors aforesaid; a-screen infrontof said lighting units; and a lens also in front of said lightingunits, all as shown and 'for the purposes'setforth.

In testimony whereof, I have hereunto set my hand in the" presence oftwo subscribing witnesses. I f JAMES M. GREEN.

Witnesses:

CHESTER W. BROWN, MARY J. PAnDoN.

